Status and Distribution: Rare in the Capital and Cowichan Valley Regional Districts. Not known elsewhere in the CIPC area.

Management Strategy: Individual plants can be excavated but all rhizomes must be removed; follow up treatment is usually necessary. Small populations can be cut, then covered with black plastic. Repeated cutting may reduce vigor of giant mannagrass while giving lower-growing plants a competitive advantage. Foliar spray of glyphosate can provide effective control.